Hobbing gear-cutter.



P. CATUCCI.l

HOBBNG GEAR GUTTER. l

APPLIUATIQN FILED MNA, 1908,

Patented Dec. 6, 1910.

9 SHEETSQSHEET l.

lwITAIEJJTEJ P. CATUGGI.

HOBBING GEAR GUTTER.

APPLICATION FILED JAN.4, 190s.

.Patented Dec. 6, 1910.

9 SHEETStSHEET 2.

INVENTOR.

w ITN Effi@ P. CATUCCI.

HOBBING GEAR CUTTER.

APPLICATION FILED IANA. 190e.

Patented De@.6,191o.

9 BHEETBLBHEET 3.

9 swims-SHEET 4.

Patented Dec. 6, 1910.

P. CATUGGI. HOBBING GEAR GUTTER.

APPLICATION FILED IANA. 1908.

WITN JJ'EJ MNE/Tori @23.14

BTK;

1 MNH P CATUGUI HOBBING GEAR GUTTER. APPLIQATION HLBVD JAN. 4. 190s.978, 1 1 3.

Patented Dec.6,1,910.

9 SHEETS-SHEET b` INVENTOR f f/" W ITN renfrew:

, P. CA-TUCCI. HOBBING GEAR GUTTER. APPLIGATIOIILED MNA. 190s` PatentedDec.i6, 191,0.

9 SHEETS-SHEET 7.

P. CATUCCI.

, HOBBING GEAR GUTTER. APPLICATION FILED MNA. 190s.-

PatentedDec. 6, 1910.

9 SHEETS-SHEET 8.

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Y f E P. 'CATUGGL Hummmy GEAR GUTTER.

AIWLIGATIOH FILED IANA. 1908.

Patented Dec. 6, 1910.

UNITED sTATEs PATENT OFFICE.

PLINY CATUCCI, 0F NEWARK, NEW JERSEY, ASSIGNOR.,` ,BY AMESNIEASSIGNMENTS,

T0 THE MEISSELBACH-CATUCCI MANUFACTURING COMPANY, A CORPORATION 0F NEWJERSEY.

HOBBING GEAR-CUTTER.

Specication of Letters Patent.

Patented Dee; 6, 1910.

Application led January 4, 1908. Serial No. 409,277.

To all whomt may concern:

Be it, known that I, PLINY CATn'ooI, a citizen of the United States,residing at, Newark, in the county of Essex and State of New Jersey,have invented certain new and useful Improvements in Hobbing Gear-Cutters, of which the following is a full, clear, and exactdescriptionLsnych as will enable others skilled in the art to which itpertains to make, construct, and use the same. l

My invention relates to that class of gear cutters wherein the blank tobe cnt is mounted upon a continuously rotating blank spindle or chuck,and the teeth in said blank are 'lin-med or generateilby means of whathas come to be known in the art of gear cutting, as a hob, and isdesigned for cutting large numbers of small gears and pinions, and whileit is more specifically designed.. to cut spur gears and pinions, yetthe adjustments are such that worm gears and spiral gears may be readilyeut without change of construction. j l

The principal feature of my improvementsI consists in the arrangement,whereby the feed of the cutter is constant, the cutter' being advancedat a speed which depends uponl the number of teeth inthe gear to be eut,and avoids the necessity of calculating the different. rates of feed forthe different numbers of teeth in the gear to be cut. rIhese variousfeeds are effected by means of a seriesI of change gears, hereinafter tobe referred to` and the rate of feed, as above stated, depends upon thenumber of teeth in the gear to be cut, o-r upon the different metals ofwhich the blank is made.

ln the accompanying drawings forming a part'y of this s|)e'-iti ation.Figure 1 is a plan view of the entire structure, showing the a1'-ralrejement of the ctmnterslmfts and the oil pumping mechanism. Fig. 2an enlarged view of the operative parts of the mechanism looking in thedirection of thearrow f/ in Fig. l. but omitting the pumping mechanismand the counterslulft. Fig. is an end view of the cutter, looking in thedirection ot' the arrow I; in Fig. 1. Fig. 4 is a sectional view takenon line c-c in Fig. 1. Fig. 5 is a complete rear elevation looking inthe direction of the arrow din Fig. 1. Fig. is a vertical i--ectionthrough the cutter carriage, with the cuttershaft removed, such sectionbeing taken on line c c of Fig.

l 1. Fig. Tis a sectional View of the cutterl carriage, showing itsmethod of angular adjustment, such section being taken on line f of Fig.G. Figs. 8 and 9 are sideelevations of the mechanism for throwing thefeed into and outof gear, Fig. S showing 'the feed in gear, and Fig. 9the gear released. Fig. 10 illustrates the oil pumping mechanism forlubricating the hob and the various parts; Fig. 11 is a vertical sectionof the three-way valve in the oil feed pipe. Fig. 12 is .a verticalsection of the same valve taken atl right-angles to that shown in Fig.11. Fig. 13 is a section of the eountershaft and the parts relatedtherewith, taken on line g-g of Fig. 1. Fig.- 11 is a. front elevationof the countershaft, and belt shifting device, partly in section,showing the mechanism for tripping the same. Fig. 15 is a similar Viewillustrating the belt-shifting device as tripped. Fig. 16 illustrates aplan view of one of the universal joints in one Oft? the drive shafts.Fig. 17 is; va detail view of the tail-stock, partly in section. endview of the tail-stock, partly in' section, showing the manner in whichthe center is held in position, and Fig. 19 is a detached end view of'the cutter slide and clutch mechanism.

Similar letters of'reference refer to like parts throughout thespecification and drawings.

In the drawings, 1 is the base or frame upon which the entire mechanismis mounted, such frame having the right-hand end portion as illustratedin Fig. Y1, broadened as at 2, for the purpose of mounting the cuttercarriage and blank spindle operating mechanism.

'3 is a standard mounted upon the base 1 to support the countershaftmechanism t. The power for driving the entire structure, with theexception of the pumping mechanisln, hereinafter described. comes from ashifting belt. 5 leading from an overhead drive shaft. The belt 5carried over the loose pulley 7 from which it may be shifted to the fastpulley (i, said 'pulleys being` mounted upon the horizontal shaft S,mountedin .suitable bearings in the frame or support 4. The outer end ofthe shaft 8 carries the driving gear t), which meshes with the drivengear '10, mounted upon an adjustable shaft 11. the shaft 11 beingcarried by an adjustable rocking frame 1Q which is mount,-

Fig. 18 is an ed upon a horizontal rod 13, carried'by the frame 4. Theframe l2. being pivoted upon the rod 13 ispcapable of adjustment towardand away from the shaft Sto provide for chan e gears to be substitutedfol-the gears 9 an 10, for a purpose hereinafter to be described. Whenthe proper gears are mounted upon shafts 8 and 11, the frame 12 isladjusted by means of the adjusting screw 14 carried'l by the projectingarm 15 from the frame 1'2, the lower end ot' said screw being connectedby means of the bolt 16 to a projection 17 from the frame 4, (see Fig.13).

` Extending laterally from each end of the "frame 4 are the projections18, which carry the slide rod 19 u on which is mounted the .beltshifting for s 20, such forks being mounted in a casting 21 securedtothe rod 19. Projecting vlaterally from the casting 21 is the pin 22.which extends through a slot 23 in a side plate 24, said side plate'being connected to the projections 1S. Mounted on the under side of thestandard 3, is a rock shaft bearing 25, carrying the rock shaft 2G, atone end of which is secured the lever 27, and at the other end of. whichis carried the rock arm 28, said rock arm having a slot 29 at its upperend lto receive the projecting pin 22 from the casting 21. The handlever 27 projects below the shaft 26 and has connected therewith, acoiled spring 30, the opposite end of' which is connected` to thestandard 3, so as to always maintain a spring tension upon the lever 27.The hub 31 of the rock arm 28 has cast thereon or otherwise securedthereto, a projection 32 for engagement with a spring pawl 33, pivotedat 34 upon the end of the bearing 25.

This lever 33 has an` upwardly projecting arm 3G to carry one end lofthe spring 37, the opposite end of which is secured at 38 to a. pinprojecting from the face of the bearing 25, the purpose of the spring 37being tomaintain engagement between the vupper end of the pa wl 33 andthe projection The spring pawl has anl extension 3), so that it can betripped by hand when desired. lt is'also provided with arod 40, leadingtoa part of the mechanism hereinafter to be described, so that thc pawl33 may be tripped automatically.

l/Vhen the hand lever 27 is in the position illustrated in Fig. 14, thebelt 5 will be 'shifted to run on the fast pulley (l, such lever beingheld in position against the tension of the spring 30 by means of thepawl 33, being in engagement with the projection 32 on the hub of therock arm lVhen, however, the paw 33 is tripped leither by the rod 40orby the handlel), the tension ot the spring 3() will cause the lever27, rock arm 28, andthe belt shi tting forks 2O to fly ,overand shiftthe belt from the pulley tl to'the loose pulley 7 and thereby stop therotation of the shaft 8. Then it is desired to start the mechanism, itis only necessary to shift the hand lever 27 into the position p and 11,are the universal couplings 41 and v 42, said couplings being connectedrespectively l'to the telescoping shafts 43 and 44. The shaft 43 has itsopposite end'connected with the universal coupling 45, which in turn isconnectedwith the main drive shaft 46. The shaft 44 isconnected throughthe universal coupling 47 to the cutter shaft 4S, said cutter shaftbeing adjustably mounted in bearings 49 in the cutter-housing 50.

The cutter-housing 5() is mounted in ways 51, for vertical adjustmentupon the cutter carriage stanchion 52,'as `clearly shown in lligs. 6 and7. Vertical adjustment of the cutter-housing 50 is accomplished by meansof the vertical screw rod 53 secured in bearings in the stanchion 52 andhas at its upper end, the crank 54, the rod 53 passing through a nutsecured to the housing 50 in any usual or desired manner, so that by therotation of the screw 53 by means of the handle 54, the verticaladjustment of the housingl 50 and with it the cutter shaft 4S isprovidedv for.

Secured to the upperend of the screw 53, beneath the handle 54, is amicrometer conc 56, by which, `line vertical adjustments of the cuttershaft may be made. The stanchionf 52 is mounted for radial adjustmentvabout the center 57, upon the slide 58, such adjustment being fixed bymeans of the bolts 59, passing through the slots G0, in the base 61, ofthe stanchion 52, and threaded into the slide 5S. At the side of thebase lll, l provide a micrometer cone (32, whereby `fine angularadjustments of the slanchion and with it, the cutter shaft 43, may bemade. Mounted upon the forward end o-'l` the slide 58, is a frame (33carryingl the mechanism for' throwing into and out 'ol gear, thecarriage feed. This carriage leod is provided for by means of alongitudinal screw 464, which receives its motion 'from mechanismhereinafterto be described. lrojecting downwardly through a guide 36, inthe foruuird end oi' the trame G3, is a vertical clutch member G5,carryiing` at. its lower end a half-nut 67, for engagement with thci'eed screw (S4. This vertical sliding clutch member (3 5 is thrown intoandout of en gagei'nent with thc feed screw (34 by means oi" a. rock arm68,' taking over a horizontal vpin G9 in the clutch member 65, said.rock

arm being mounted upon thorock-shaiit 7U.

The rock shaft 70 is mounted in suitable.

rovid ed with )awl 73, pivotally mounted at 74 upon a l to bring theteeth of the cutter back into racket 75, integral with the frame tti-.HurH v rounding the shaft 70, and within the frame 73e, is a coiledspring 7G, one end of which secured to the shaft and the opposite end tothe frame (S3. this spring is to throw the shaft into the positionillustrated in Fig. 9, when the pawl 73 shall have been tripped fromengagement with the arm '72. In this manner, the tripping of the pawl 73in a manner hereinafter to be described, will result in releasing theclutch from the feed screw 64. 77 is a small flat spring bearing uponthe lower extended end of the'pawl 7 3, for the purpose 0f 4maintainingthe pawl 73 in engagement with the arm 72.

The slide 58 travels upon the guide 78 in a, direction at riglit-anglesto the normal position of the shaft 48. 'Mounted upon the side of thebed and so arranged as to be adjustable therealong, are the two stops7S) and 80, arranged in the path of a pin 81. projecting laterally fromthe lower end of the paw] 73, so that when the carriage slide 58 hasbeen fed by means of the feed screw U4. heretofore described, to the endof the desired stroke, the engagement of the pin 8l with the stop 79,will trip the pawl 73 from the varm '72. when the spring 76 will bebroughtI into action throwing the rock shaft and arm 68 in a position toelevate theI clutch G5 with its haltnut ($7 out of engagement with thefeed screw 64, when all further-inovelnent of the carriage slide ,58will cease.

The cutter shaft 48, heretofore described, as being mounted in thebearing 4t) of the housing 5t), projects through said hearing to asu'iiieient distance to permit of the mounting thereon` of the hob 82,directly over, or if desired, directly under, the position of the-workpiece to be operated upon the particular position of the cutter 82,being governed by the elevation or depression of the housing 5t).

The longitudinal adjustn'ient of the cutter shaft or spindle 48, formsan important feature of my invention, as it enables me to bring allparts of the cutter successively into loperation, as for example, whenone partl becomes worn", the bearing 49 with the spindle 48 may beshifted along to bring a new part of the cutter 82 into operation.Again, the radial or angular adjustment of the stanchio-n 52 about thecenter 57 and with it the spindle 48, might be to so great. an angle asto carry the cutter 82 entirely away from `the -work piece. Thislongitudr nal adjustment of the spindle bearing and` spindle a'ordsmeans to so extend the entier to such a point that it ma' always engagethe work piece, no matter what theangnlar adjnstmentI of the spindle mayhe withinthe limits of thefdevice. It further enables me Thev normaltendeney of I synchronous movement with the teeth of the gear blank,should ity at any time be necessary to remove the cutter fromiitsspindle, as for example, to substitute a new cutter or to sharpen theold one. Under these circumstances, with the blank partly ont, itbecomes necessary to replace the cutter in exactly the same synchronousrelation with the work piece that the original cutter occupied.

I will now proceed to describe the mechanism for dri ving theworkspindle.

The shaft ttt leads into a slightly inclined bearinv 83. mounted n )on'acarriaee 84 D i b 7 which travels in ways 85 at right-angles to thetravel of the carriage slide 58. 'lhc inner end of the shaft 4G isprovided with a worm, engaging the worm wheetvt. mounted upon a shaft87, carried in suitable bearings 88 on the housing 84. The, outer end ofthe shaft 87 carries a gear 89, which in turn engages a gear 9() uponthe rear-end of the work spindle 91. The two gears`8$l and Si() arechange gears, others being provided for producing a different rotationalratio bctween' the work spindle shaft 91 and the cutter shaft 48. Inorder to provide for different. sized gears to be substituted for 89 and90, whatever their size may be, I make the housing or carriage 8%adjustable to and from t-he work spindle 91, so tliatwvhen the propergears are determined upon, the housing may he adjusted so as to bringthe corresponding gears 8l) and 9() into suitable engagement. Thehousing 8l may then be fixed in posit-ion by screwing home the nuts uponthe bolts 92. rlhe longitudinal adjustment of the housing 84 may bedelicately provided for by means of the ling 33, carrying the screwSlet, which passes through a suitable lug adjacent thereto, the lug 95-being also longitudinally adjustable upon the bed.

Rigidly mounted upon the shaft 91, inside, of the gear Slt), is anotherspur gear Siti, which in turn is in engagement with the gear 97, carriedby the rock arm 9S, said rock arln being mounted upon the end of theshaft 9S). Rigidly mounted on the shaft. 99, a gear ltlt). forengagement with the gear 97. so that the rotation of the gear Elli maybe eomninnicattal to the shaft Ell), through the gears .)7 and 10U. 'lhegears just described, are also change gears, so that ditt'erentrotational ratios may he provided for between the shaft 91 and the shaftSlt). ln order 'to provide for the angula' adjustment of the arm 98, soas to maintain proper engagementr between the gears 96 and 97. I extendan adjusting arm lo! tio the rear of the shaft 99. so that said arm maybe engaged by an adjacent screwvltri.

The work spindle 91 extends through bearings in the housing in? saidhousing .being'suitably secured to the bed of the 'machine by means ofthe bolts 104. This work spindle is substantially the same in structureas the ordinary head stock of a lathe, andv for that reason, it is notdeemed necessary to further describe the same, other than to say, thatthe ordinary chuck 105 may be secured therein, in which to hold a rod ora mandrel, which carries the blank gear to be cut. The shaft 91 is alsoprovided at its forward end 106 with a screw by means of which the1ordinary face plate may be applied to the lead stock:

The shaft 99 extends through the bed, and carries upon its opposite end,a miter gear 107, which engages with a correspondine niiter gear 108,mountedupon a short shaft 109, carried in an inclined bearing 110, saidbearing being suitably mounted uponv the bed. The opposite end of theshaft 109 is provided with a -worm 111, which is in engagement with theworm wheel 112, said worm wheel being carried by the forward' end of thefeed shaft (34, said feed shaft extending through from one side of thebed to 'the other, and 'having at its opposite end, the crank 113 forhand manipulation. The worm wheel 112 is loosely mounted upon the shaft04', so that the crank 118 may be rotated in the same direction as therotation of the shaft 6st to accelerate the movement of the slide 58, soas to bring the cutter 82 quickly' into position for .wor-k, and this,is accomplished by means of the pawl and ratchet mechanism 114 and 115,the spring pawl 115 be'- ing mounted upon the face of the worm wheel andengaging the Aratchet 114C, which is rigidly secured to the shaft "64.When the clutch G5 is disengaged from'the feed screw 6ft, the slide 58may be readily moved along its ways in either direction. It will thus beseen that when the two shafts 13 and 4d are driven, the motion of theshaft 43 is communicated directly to the cutter 82, while the motion ofthe shaft 14 is communicated through the worm wheel 86, and aroundthrough the gears 89 and 90 to the Work spindle and from the gear 96through the gears 97 and 100 to the shaft 99, and thence throughthegears 107, 108, 111 and 112'to the feed shaft G4, so that wheneverything is in readiness for cutting a geary wheel, the cutter 82 willsimultaneously rotate and be fed forward with the carriage slide 58. andthis, while the work spindle and the blank carried thereby, are alsorotating, the rate of rotation between the cutter andthe work spindlebeing governed by the change gears heretofore referred to, and amountingto one complete revolution of the cutter to the advancement of one toothof the blank. The stop 79 being properly located to trip the clutch 65,when the work of cutting the blank 'is completed,

it will be seen that the pin .81 contacting with said stop 7 9 at theproper moment, will trip the lever 71 and thus throw the feed clutch G5out of engagement with the feed screw 64.

Under some circumstances, the .fixing -of' the blank to be c'ut into the.chuck 105, is all that is necessary for the support of said blank.There are cases, however, where the work piece will be so'frail .thatsuch support would be inadequate, under the strain produced by thecutter 82, so that it becomes necessary to support the blank not onlyfrom the chuck end, but, also from the opposite end of the blank, and inorder to provide for this, I mount upon the guides 11G, a tail stockcarriage 117, and upon said carriage 117, a supplementallcarriage 118,also carried by Ways 119 on the carriage 117.

Projecting laterally from the carriage 117,

is an4 arm 120, which forms a pivot bearing for the lever 121, the rearend of which lies across the upper face of the carriage 118, and isconnected to said carriage by means of a coiled spring v122 to a pin123, upon the rear end of the carriage 118.

Upon the side of the carriage 117,11 mount.

work piece or spindle upon which said work piece 1s carried, and thecenter 128 is held against such work piece under the tension Projectingupwardly from the upper of spring 122, it being understood that when thelever 121 is carried forward, as dev scribed, the gravity pawl 125 willrise into the path of lever 121 and prevent its backward movement underthe tension of spring 122.

The carriage 117, in ordinary practice, is moved along Aits guides'untilin a suitable position, when it is fixed in place by means of the screws129, bearing at their inner ends upon the guides110,.when further adjustment of the center 128 will be made through the lever 121, the spring122 and the contiguous parts. If desired, the slide 118 may berigidlysecured to the carriage 117 by means of the hand screw130, theinner end of which bears upon the guides 119.

The center 128 differs from the ordinary center found in the tail stocksof lathes andI similar machine too-ls. inthat it comprises a little morethan half as illustrated in Fig.

cylindrical'bearing 131, which in turn is secured to the slide by meansof the screws .132. The, tail of the center 123 is conical and `isinserted in the conical seat in the ordinary way of inserting centers intail stocks, but particular attention is called to the fact that thebearing 131 and the'center 128 coi-nprise's a little more than half ofthe correspondingparts in other machines, the purpose being to reducethe height of such parts to the lowest possible limit,` so as not tointerfere. with the cutter 82, when cutting very small pinions andgears.

In gear cutting, it is necessary in order that there-shall be greataccuracy in the work tiirned out, as small a resistance between theblank and the cutter as possible, and in order to reduce this resistanceto a minimum, it is necessary to have a constant stream of oil over thecutter and blank. In order to provide for this oil supply, I mount apump 133 upon the hed 1, as clearly illustrated in Vig. 1. This pump maybe of any desired or preferred forni, being driven. by means' of apulley 1.31, which receives its .motion from the belt 135 leading fromany convenient,- source of power, preferably the saine shaft whighdrives the belt heretofore referred to. This pump receives its supplythrough the pipe 136, from the reservoir 137. located beneath the bed 1.The ordinary check valve'138 is located in the supply pipe 136. Leadingfrom the pump is the feed pipe 139, such feed pipe leading to the pipe140, through a valve 14:1, the end of said pipe 110' terminatingdirectly over the cutter SQ, as clearly shown inFig. 10,

In order to provide a convenient mechanism for simultaneously stoppingthe machine and cutting otf the oil supply, I locate a rock shaft 1112,upon the bedof the inachine,y such rock shaft lying parallel with themovement -of the slide 58, .and mounted -in bearings 143 at either endof the machine bed. This rock shaft is provided with an upwardlyextending arin 114, at' the upper extremity of which is a connecting rod145 leading to the. three-.way valve plunger 146 of the valve 141. abovereferred to, the details of which will be subsequently set. forth.

` .Extending dowi'i'ii-'ardly also from thel roc-k shaft 1.12, is an arm147 from the lower extremity of which leads the rod 40, to the trippingpani 232i. heretofore described. Ad-

' ,iustably mounted upon the shaft 112, and

projecting laterall)r toward the path of'tlie frainet. is the strikerarm 14S, the forwar'd end of sa'id striker arm being provided with ahead 14?; which lies in the path of the pin 156. projecting laterallyfrom the arm T2., heretofore described. The striker arm 11n issn locatedupon the rock shaft 142. that.

mechanism through the arm 72 and' rock shaft 70, the in 15() will liedirectly over the head 149. The impulse of ther pin due, to the spring76 will be sufficient to tilt they striker arm 148 downwardly into theposition illustratedin Fig. 9, in which position, the connecting rod 145will have been retracted in the direction ofthe arrow 151, to close offthe oil supply through the pipe 140 and open the valve plunger 146 toldirect the fiow of oil through the pipe 152, back to the reservoir 137.Simultaneously1 with this movement, the lower arm 147 will V have thrusttherod 40 in the ldirection of the arrow 153, to trip the llockingvpawl`33, thereby' permitting the spring 30 to shiftthe belt 5 from the fastpulley 6 tothe loose pulley 7,

in a manner hereinbefore described. lThus the travel of the slide 58produces an immediatyJ and simultaneous stoppage, not only of the cuttershaft, but also of the blank spindle. and. blank, and with it, the feedscrew 64, this only occurring when the blank has been completely cut andis lready to be replaced 'by another blank. The cutter carriage may nowbe slid forward int-o position out. of the way of the new blank, whenthe same may be inserted, and in order to form a safety device wherebyaccidental movementof the slide and with it, the cutter carriage. inalvbe prevented, I locate on the side of the frame 63, a guide 154;, inwhich the verticall)i ino'vmg'bolt 155 is located, saidl bolt beinggiven .a normal downward tendency tlirougl'i the spring 156. I provideupon the side of the bolt 155, a pin 157 for engagement with the upperside of the arm 72so that when said arm is raised in the position.indicated in Fig. 8, the bolt. 155 will be simultaneously raised, so asto clear the end of the ilat stop 157. which is secured to the bed b vthe bolt passing through the integrally connected supplemental stop 158`secured to the bed by means of the bolt 159, as clearly shown in Figs. 8and 9.

The valve 141, heretofore referred to,con sists of a special casting160, somewhat likev a. gas pipe. T, having the supply passage 161 intowhich-the discharge pipe 14() is inserted.-` Centrally through thiscasting, and at right-- angles to the members 161 and 162, is a passage163,- into which is inserted a ported bushing 164. Thisbushing. isprovided with a discharge port 165, leading into' the dis-- charge pipe140, and a somewhat elongated port 166, leading froin the supply Apipe13). Leading laterally also from this bushing 164, is a. return flowport 16,7, leading to the return pipe 152. The plunger l146 issubstantially cylindrical, and fitted closely to Aslide longitudinally-in the bushing 164, to bring the reduced cylindrical portion 168' intoalternate registry with the .ports 165 and 167 in the bushing164. Thetwo positions l of the plunger 146 will correspond to thesei ,beingconstan'tl forced through pipe 139, 1t

may be shunte through either one of these ports to the pi e 140, or the.ipe 152, this being governs by the roc shaft 142 through the connectingrod 145. Thev overflow of oil which is poured upon the cutter 82 ispermitted to trickle down over the structure and is \caught in thetrough 169,

around the bed of the machine, from which it is conducted to thereservoir 137 through the ipe- 170.

I e universal joints in the 4telescoping shafts 43 and 44 possess novelfeatures which I will now proceed to describe. Referring to Fig. 16, theuniversal joints 41 and 42, 45 and 47 are all alike, and consist of theduplicate knuckles 171, provided'with'apertured' lugs 172, throu h whichthe stud bolts 173 are-screwed. T e inner or adjacent ends of the studs173 are conical as at 174, and are vinserted in a substantially squareblock of metal 175; The apertures in the block 175 are conical to fitthe conical ends 174 of the studs 173, such apertures being located atright-angles to each other, and being four in number, the twodiametrically opposite ones being for the reception of the pins upon`one of the knuckles 171, and the other t-wo apertures being for thereception of the corresponding studs upon the other knuckle. Theparticular feature of this universal joint, resides in the fact that thestuds 174 are conical and as wear takes place, vbetween the bearings,the studs 173 may be screwed home so as to` readjust the bearing.

I claim 1. In a gear cutter, the combination of a rotating cutterspindle, a cutter mounted thereon, a work spindle in operativerrelationto' said cutter spindle, supports for said spindles', driving'vmechanism for simultaneouslyrotating said spindles, feeding mechanismfor advancing one of said 's indles relatively to the' other spindle, a.roer shaft having an arm thereon for directly engaging the su port 'ofthe advancing spindle,

saidrock s aft having a connection to said driving mechanism forautomatically stopping the same at apredetermined position of said4advancing spindle.

A2. In a bobbing gear cutter, the combination of a cutter spindle with abobbing cutter mounted thereon, a work spindle;su b-. stant'ially atrightfangles to said eutter spindle, feeding mechanism tor advancin saidcutter spindle in a path parallel to sait work spindle, drivingmechanism for said spindles consisting of a drive shaft directlyconnected to said cutterspindle, a driven shaft parallel to said driveshaft and connected by in.. termediate change gearing to the said work sindie, means for adjusting said -driven a aft toward and away from saiddrive shaft, and change gearing connecting said ychange shafts wherebythey are const-rained to rovtate at a predetermined relative rotational.

ratio and thereby produce a predetermined relative rate of rotationbetween said cutter and drive spindles respectively. Y

3. In a-hobbin gear cutter, the combina tion of cutter an work spindlesrespectively mounted at .right-angles to each other on suitablesupports, drive mechanism for said spindles consisting of a drive shaftmounted in tixed bearings and a driven shaft mounted parallel to andadjustable toward and away from said drive shaft, intermeshing gearingmounted upon said shafts for prot ucing a predetermined relativerotational ratio between them, a flexible Shaft directly connectin saiddrive shaft to said Glitter spindle an between the driven shaft and .thework spindle.

4. ln a bobbing gear cutter, the combination of cutter and work spindlesrespectively mounted at right-angles to each other'on suitablesupports,drive mechanism for said spindles consisting of a drive shaftmounted in fixed bearings and a driven shaft mounted parallel to andadjustable toward and away from said drive shaft, intermeshing changegearing mounted upon said shafts change gear connection in fixedbearings and a driven shaft mounted parallel to and adjustable towardand away from said drive shaft, intermeshing change gearing mounted uponsaid. shafts for producing a predetermined relative rotational ratiobetween them, a' flexible shaft directly eonnectin said drive shaft tosaid cutter spindle and change Gear connection between thedrivenshaftant the work spindie, feed mechanism actuated by said workspindledrive mechanism, 'for advancing the cutter spindle in a path paralleltothe axis of the-work spindle, and mechanism actuated by theadvancement of the cutter spindle support for stopping the rotationoil-v said drive shaft.

6. In a bobbing gear cutter, the eo1nbina' tion of cutter and workspindles respectively mounted at lright-angles to each other in suitablesupports, a drive shaft mounted in fixed bearings' and directlyconneotedto Vro.-

tate said cutter spindle, a driven shaft connected to said work Spindleby intermediate gearing, a traine located adjacentl to said drive-shaftt'or adjustably supporting said driven shat't parallel to and atvarying'dis-- 'tances t'rom said drive shaft, intermeshing change gearsmounted upon Said shafts respectively whereby said sha t'ts and spindlesare constrained to rotate at predetermined relative ratios.

7. ln a bobbing gear cutter, the combination ot a cutter spindle and aWork Spindle, inter-connected driving mechanism for rot'ating saidspindles, feeding mechanism for advancing the cutter spindle in a pathparallel to the axis of the vvorlt spindle. inde* pendent'ly drivenmeans mounted upon the gear cutter bed itor supplying a continuousltion' ot' lubricant upon the vvork operated upon. a roclt shaft havingan arm thereon t'or engaging with the support ot' Said advancingspindle. said rock shaft having connections lo said lubricantsupplymeans and to said spindle driving mechanism for automaticatly stoppingSaidl Spindle driving mechanism and diverting the lubricant `aupplytroni the work at a predetermined point otl :ulvanceinent of said cutterspindle.

H. ln a bobbing gear cutter, the combina tion ol' a cutter slide, acutter spindle with a cutter rotatably mounted on said slide, teedingmechanism t'or automatically advancing said slide and with it saidcutter upon the work to be operated upon, a rock shaft lying parallel tothe path of said cutter slide. and having an adjustable arm thereonlt'or engagement with a projection upon said cutter slide. a connectionbetween said roel; shat't and the driving mechanism tor .said cuttert'or automatically stopping .sa'id driving mechanism and trippingmechanism associated with said arm for tripping said feeding mechanismat a predetermined position otl said cutter slide.

9. In a gear cutting mechanism, the combination of a laterally movingcutter spindle. a belt driven shaft, a flexible shaft. con necting saidcutter spindle and said belt driven shaft, a fast and a loose, pulleycarried by Said shaft, a manually operated lever forshiftiug a belt tromthe loose to the fast pulley and a spring tor shi'ttii'ig the belt fromthe ,tast to the loose pulley. a latch pawl to hold said lever againstthe act-ion of said spring` and connections between saidY pawl `andvSaid spindle actuated by the lateral movement of said spindle fortripping Said pawl. i,

1t). 1n a gear cutting machine,`the combination of a laterally movingcutter spindle, and tripping mechanisi'n. a belt driven shaft, aflexible Shaft connecting said spindle and said shaft, a fast and aloose pulley carried by Said shaft., a manually operatedv lever forShifting a belt. front-the loose pulley to the tast pulley, a spring forshifting the belt trom the fast to the loose pulley, ay latch paul torreleasing said spring, a rock shaft connected to said latch pand, and anarm on .said rock shaft lying in the path of and actuated-by saidtrippingr mechanism to trips-aid pau'l at a predetermined point in themovement otl .said cutter spindle.

1l. ln a gear cutting machine, the comi bination of a cutter spindlemounted upon a nism to :shit't the belt. from the tast-to the loosepulley.

12. In a `fear cutter provided vwith a cutter spindle and a WorkSpindle. the combination ot' work lubricating means mounted upon thegear cutter bed, suitable means 't'or producing and directing acontinuous'tion' ot lubricant upon the cutter and \\'orl -picce.

a lubricant supply ivell, a valve for directing..r the tion' otlubricant tothe workA piece and automatic means actuated by the advanccment ot' the cutter spindle for operating said valve to divert saidlubricant back to the supply Well.

13. ln a gear cutter and lul. 'i .'.itiiigi1ieaiis therefor, thecombination ot' a cutter Spindle and a \vorl\V spindle, drivingmech-.mism for rotating said spindles 'and tor advancing the cutter in apath' transversely to its axis. a lubricant well secured tothe gearcutter bed, a pump mounted thereon provided with independent drivingmeans, means for diA reeting the tlow of the pumped lubricant upon thework-piece and cutter, and. means operated by said advancing spindle forstopping the tlovv ot lubricant upon the workpiece and diverting itbachr to the well.

14. ln a hobbing gear cutter, the combination ot' a cutter spindle. atransverse slide upon which said cutter spindle is mounted` a workspindle parallel to said slide. a pair ot' parallel shafts atright-angles to said slide. one otl said shatts being' belt driven andflexibly connected to said. cutter spindle, a rocker frame 'inivhiclrthe other shaft is `mountcd, means for adjiisti'ng said rockerframe and Shaft transveragjl)` to accommodatey changegearsbetvveei-i-said shafts, and connections foradrlving saidwvorkspindle 'from said rocker `trame shaft..y

15, In a bobbing gear cutter. the co|nbination ot' a cutter spindle. atransverse Slide upon which said cutter spindle is mounted. feedmechanism for advancing said slide. a work spindle parallel to saidslide,a shaft parallel to said Work spindle and driven therefrom, gearconnections between` said spindle driven shaft and said feedrineclianismfor feeding said slide,and pawl and ratchet mechanism in said gearconnections y to permit of independent manual operation of said feedmechanism.

16. In a `bobbing gear cutter, the combination of a transverse slide, acutter spindle carried thereby, feeding mechanism for advancing saidslide, a work spindle parallel to said slide, means for driving saidfeed ing mechanism from said work spindle, a belt driven shaft connectedto drive said ,cutter and work spindles, a spring actuated beltshift-ing mechanism in proximity to said belt driven shaft, a latch aivlfor releasing said belt shifting mechanism to cut 0H the power from saidspindles, a rock shaft par-` allel to said cutter slide carrying a rockarm, a link connecting said rock arni and said latch pawl to operate thelatter from the former and means for operating said rock "shaft from theadvancing transverse slide.

'ajbearing box for said spindle, a work spindle,a geared' connectionbetween said spindles, means for longitudinally adjusting said boxvand4itsspindle to bring the teeth of the cutter into synchronous movementwith the work tobe operated upon. 19. In a bobbing gear cutter, thecombination of an arigularly adjustable and laten' ally movable cutterspindle, a bobbing cutter mounted thereon, a Work spindle atsubstantially right-angles to said. cutter spindle, means forsimultaneously rotating said spindles, means for longitudinallyadjusting said cutter spindle to bring the teeth of the cutter intosynchronous movement with the work spindle at any angular adjustment ofsaid cutter spindle.

20. In a bobbing gear cutter, the combination of a bed provided withtransverse slide- Ways,` a slide mounted thereon, feeding mechanism forsaid slide, a standard mounted upon said slide, 'a cutter spindlecarried by said standard transversely to said slide, a fixed standardmounted upon said bed pro vided withlicarings for a belt driven shaftmounted in said bearings said 'shaft being F ldisposed at right-anglesto said slide ways,

a rocker frame pvoted to said fixe-d standard carrying a second shaftparallel to and transversely adjustable with respect to said Ibeltdriven shaft, change gears secured to the ends of said shaftsto drivethe second shaft from the belt driven shaft and interconnected shaftsand gears for operating said slide feeding mechanism from said. secondshaft.

2l. ln a hobbing gear cutter, the combination of a bed provided withtransverse slide Ways, a slide mounted thereon, feedin mechanismtherefor, a standard mounte upon said slide carrying a cutter spindle,

'a belt driven shaft mounted in a fixed standard upon said bed, flexibleconnections from said shaft to said spindle for driving the latter, fastand loose pulleys upon said shaft, belt shifting mechanism mounted uponsaid lixed standard, a latch pawl for holding said belt shiftingmechanism with the belt l upon the fast pulley and a spring forretracting the belt shifting mechanism when said latch is released,a'rock shaft mounted upon thc bed parallel to said slideways, a rock armextending vertically from said rock shaft, a link connecting said rockarm to said latch pawl, a rock arm extending hori- Zontally from saidrock shaft toward said slide and an ladjustable shoe on said slide,operating on said horizontal rock arm to release said latch pawl whensaid slide reaches a predetermined position.

22. In a gear cutter, 'a laterally movable .cutter spindle, a relativelyfixed work spin- `said s indles consisting of a relativelh fixed driveshaft connected by a flexible shaft to said movable spindle, and adriven shaft parallel to and adjustable toward and away from said driveshaft, said driven shaft bcing connected by a flexible shaftthroughintermediate gearing with said fixed 'spinldle, and intermeshing changegears mounted upon said drive and drivcnshafts.

24. ln a gear cutter, the combination of a countershaft standard, adrive shaft rotatably mounted in said standard, and a driven shaft lying.parallel with the first mentioned shaft, meansfor adjusting said drivenshaft toward and away from said driv'e shaft .to

provide for intel-meshing change gears rigidly secured to said'shafts, acutter spindle,

iso

a Work 'spindle and flexible shafts connect.- ing said drive and drivenshafts 'respectively withthe cutter spindle andthe work spindle.

25. In a gear cutter, the combination of a drive shaft bearing standard,a drive shaft rotatably mounted in said standard, a frame pivotallysecured to said standard, a driven shaft rotatably mounted in saidframe, said driven shaft lying parallel to said drive shaft,intermeshing change gears mounted upon said shafts, means for adjustingthe driven shaft frame toward and away from said drive shaft to providefor said change gears, and flexible shafts connecting said drive anddriven shafts respectively with thecuttcr spindle andthe work spindle.

26. Ina machine tool, provided with a rotating laterally moving tool anda simultaneously rotating work piece, the combination of a drive shaftfor said tool, a driven shaft parallel to and adjustable toward and yaway from said drive shaft, intermeshing change gears mounted upon saidshafts and flexible shafts connecting said drive shaft and said drivenshaft respectively with said rotating tool and said rotating work piece.

27. In a machine tool, the combination of a rotating laterally movingtool, a rotat-l ing but relatively fixed work spindle, with means fordriving the said tool 4:and spindle comprising an independently mounted*standard, a flexible shaft connecting said drive shaft to said tool, adriven shaft mounted upon said standard arallel to and adjustable towardand away om said drive shaft, intermeshing change gears connecting saiddrive shaft and driven shafts and a flexible shaft connecting saiddriven shaftl to said work spindle.

28. In a machine tool, the combination of a rotating laterally movingtool, and a rotatf ing relatively ixed work spindle with mechanism fordriving said tool and s indle, comprising a stationary drive sha tChaving a change gear mounted thereon, a driven shaft having a changegear mounted thereon for engagement with the first named change gear7means for adjusting said driven shaft toward and way from -said driveshaft, and

telescoping shafts with universal couplings connecting said drive andsaiddriven shafts respectively with said tool and saidwork spindle.

This specification signed and witnessed this 22d day of November 1907.

PLINY oATUccI.

Witnesses:

Louis M. SANDERS, C. A. ALLIsToN.

